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  <title>The MongoMinKey class</title>

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 <h1 class="title">The MongoMinKey class</h1>
 

 <div class="partintro"><p class="verinfo">(PECL mongo &gt;= 1.0.2)</p>


  <div class="section" id="mongominkey.intro">
   <h2 class="title">简介</h2>
   <p class="para">
    <strong class="classname">MongoMinKey</strong> is a special type used by the database 
    that evaluates to less than any other type.  Thus, if a query is sorted by a
    given field in ascending order, any document with a 
    <strong class="classname">MongoMinKey</strong> as its value will be returned first.
   </p>
   <p class="para">
    <strong class="classname">MongoMinKey</strong> has no associated fields, methods, or
    constants.  It is merely the &quot;smallest&quot; thing that can be inserted into the
    database.
   </p>
  </div>


  <div class="section" id="mongominkey.synopsis">
   <h2 class="title">类摘要</h2>


   <div class="classsynopsis">
    <div class="ooclass"></div>


    <div class="classsynopsisinfo">
     <span class="ooclass">
      <strong class="classname">MongoMinKey</strong>
     </span>
     {</div>

   }</div>


  </div>

  <div class="section" id="mongominkey.example">
   <h2 class="title">Using <strong class="classname">MongoMinKey</strong> as a value</h2>
   <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$collection</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">insert</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"task"&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">"lunch"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"do&nbsp;by"&nbsp;</span><span style="color: #007700">=&gt;&nbsp;new&nbsp;</span><span style="color: #0000BB">MongoMinKey</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">$collection</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">insert</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"task"&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #DD0000">"staff&nbsp;meeting"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"do&nbsp;by"&nbsp;</span><span style="color: #007700">=&gt;&nbsp;new&nbsp;</span><span style="color: #0000BB">MongoDate</span><span style="color: #007700">(</span><span style="color: #0000BB">strtotime</span><span style="color: #007700">(</span><span style="color: #DD0000">"+4&nbsp;days"</span><span style="color: #007700">))));<br /><br /></span><span style="color: #0000BB">$cursor&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$collection</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">find</span><span style="color: #007700">()-&gt;</span><span style="color: #0000BB">sort</span><span style="color: #007700">(array(</span><span style="color: #DD0000">"do&nbsp;by"&nbsp;</span><span style="color: #007700">=&gt;&nbsp;</span><span style="color: #0000BB">1</span><span style="color: #007700">));<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
   </div>

   <p class="para">
    The cursor will contain the lunch document, then the staff meeting document.  
    The lunch document will always be returned first, regardless of what else
    is added to the collection (unless other documents are added with
    <strong class="classname">MongoMinKey</strong> in the &quot;do by&quot; field).
   </p>
  </div>
 </div>

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